VISCOUNT "WALDEN ON THE BIED8 OF CELEBES. 103 



male ; Gorontalo, 27th May and 20th July, male and female ; Ayer-pannas, 11th, 15th, 

 17th August, males and females; Limbotto, 13th September, female; Pagouat 29th 

 July, a nestling (Von Rosenberg); Macassar, E. Timor (Wallace); Philippines (Cum- 

 ing) ; Java (Diard); New Caledonia (Verreaux). Conf. Hartl. & Finsch, Centralpolyn. 

 p. 212. 



According to Mr. Sclater (I. c.) there appear to be three races of this Tree-Duck — 

 the Philippine, which is the type, the Australian (D. gouldi, Bp.), and the one inhabiting 

 Celebes and Timor. It is true that at a later date (P. Z. S. 1866, p. 149) Mr. Sclater 

 maintained that the three races are not separable. Professor Schlegel mentions that 

 this species only occurs accidentally in Java. 



LAEID^E. 



Sternin^. 

 Hydrochelidon, Boie. 



184. Hydrocheijdoit nigra (Linn.), Syst. Nat. ed. 12, i. p. 227 (1766); Schlegel, Mus. 



Pays-Bas, Sternce, p. 31. 



Sab. Northern Celebes (Forsten, fide Schlegel) ; Northern Africa ; Southern Europe ; 

 Northern and Eastern Asia. 



I include this species on Professor Schlegel's authority. It has not been recorded 

 from any other island of the Malay archipelago, although found throughout China 

 (Swinhoe). Its occurrence in India rests on the evidence of specimens collected by 

 Dr. L. Stewart (Jerd. B. of India, iv. App. p. 875) ; in what part of India, is not 

 mentioned. 



185. Hydrochelidon leucopareia (Natterer), Temm. Man. d'Orn. 2nd ed. ii. p. 746 



(1820), "Hungary;" Verner, Atlas, pi. 



Sterna grisea, Horsf. Trans. Linn. Soc. xiii. p. 199, " Java" (1822). 



hybrida, Pallas, Zoog. Rosso-Asiatica, ii. p. 338 (1831), " Volga ; " Schlegel, Mus. Pays-Bas, 



Sternce, p. 32. 

 Viralva indica, Stephens, Shaw, Gen. Zool. Aves, xiii. p. 169, "India" (1825), ex Lath. Gen. Hist. 



x. p. 103. no. 5. 

 Sterna delamotta, Vieill. Ency. Meth. Orn. Add. i. p. 350, "Europe" (1823). 



similis, J. E. Gray, Illust. Ind. Zool. i. pi. 70. f. 2, ex India (1832). 



Hydrochelidon fluviatilis, Gould, P. Z. S. 1842, p. 140, "interior of New South Wales." 

 delalandii, Bp. Compt. Rend. xiii. p. 773, "Cap. B. Spei" (1856). 



Hob. Lake of Gorontalo, 8th of October, female passing into winter plumage (Forsten) 

 Pontianac, in Borneo (Diard) ; abundant in India (Jerdon) ; Ceylon (mus. nostr.) ; S.-W. 

 Formosa (Swinhoe); interior of Australia (Gould); Cape York (mus. nostr.); Java 

 (Eorsfield) ; South and South eastern Europe ; Northern and Western Africa. 



